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'Dialed In' Otto Langen full size 1/2 HP Reproduction Engine
After a week of playing and adjusting the engine it is quite happy running at about 45 RPM on governor control. Firing once every 30 seconds using 0.02 cuft gas each time. The "groaning" you hear is actually the stainless steel check ball inside the valve body ( just to the left of the slide valve)
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